No one needs a scanner anymore
I just use a nifty little app on my iPhone, DocScanner. You take pictures of the doc through the app, it recognizes the edges of paper, scans it into high quality black and white or colour, and allows you then email the document as PDFs, JPEG etc. It’s much quicker and easier than using an external scanner, and doesn’t take up any space (other than a few MBs on your phone). Highly recommended.
I’m excited to see what other physical devices will be replaced by software in the coming years - a trend I wrote about at the beginning of the year in the Guardian PDA blog.